161885534 has 16 divisors (see below), whose sum is σ = 254409216. Its totient is φ = 77160600.

The previous prime is 161885513. The next prime is 161885561. The reversal of 161885534 is 435588161.

It is a super-2 number, since 2×161885534² = 52413852236930312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161885491 and 161885500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15332 + ... + 23639.

It is an arithmetic number, because the mean of its divisors is an integer number (15900576).

Almost surely, 2^161885534 is an apocalyptic number.

161885534 is a deficient number, since it is larger than the sum of its proper divisors (92523682).

161885534 is a wasteful number, since it uses less digits than its factorization.

161885534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39071.

The product of its digits is 115200, while the sum is 41.

The square root of 161885534 is about 12723.4246176098. The cubic root of 161885534 is about 545.0077534458.

The spelling of 161885534 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, five hundred thirty-four".